EP1394489A2 - Installation for drying and treating of mineral pourable material - Google Patents

Installation for drying and treating of mineral pourable material Download PDF

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Publication number
EP1394489A2
EP1394489A2 EP03019112A EP03019112A EP1394489A2 EP 1394489 A2 EP1394489 A2 EP 1394489A2 EP 03019112 A EP03019112 A EP 03019112A EP 03019112 A EP03019112 A EP 03019112A EP 1394489 A2 EP1394489 A2 EP 1394489A2
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EP
European Patent Office
Prior art keywords
drum
shaft
installation
rotary drum
circumference
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03019112A
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German (de)
French (fr)
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EP1394489A3 (en
EP1394489B1 (en
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Erfindernennung liegt noch nicht vor Die
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Enerco BV
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Enerco BV
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/14—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge
    • F27B7/16—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being fixed relatively to the drum, e.g. composite means
    • F27B7/161—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being fixed relatively to the drum, e.g. composite means the means comprising projections jutting out from the wall
    • F27B7/162—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being fixed relatively to the drum, e.g. composite means the means comprising projections jutting out from the wall the projections consisting of separate lifting elements, e.g. lifting shovels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/34—Arrangements of heating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/32—Arrangement of devices for charging
    • F27B7/3205—Charging
    • F27B2007/3211—Charging at the open end of the drum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/36—Arrangements of air or gas supply devices
    • F27B7/362—Introducing gas into the drum axially or through the wall
    • F27B2007/367—Introducing gas into the drum axially or through the wall transversally through the wall of the drum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/33—Arrangement of devices for discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/36—Arrangements of air or gas supply devices
    • F27B7/362—Introducing gas into the drum axially or through the wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/08—Screw feeders; Screw dischargers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/02—Supplying steam, vapour, gases, or liquids

Definitions

  • the invention relates to a plant for drying and processing free-flowing mineral goods, especially coal according to the generic term of claim 1.
  • Mineral material falls in the extraction and Processing mostly in the form of a mixture of lumpy or granular Good and fine-grained and dusty good.
  • predetermined fractions for example general cargo, coarse-grained, fine-grained and to be able to separate dusty material
  • the proportion above is first a predetermined grain diameter as a piece goods by sieving separated.
  • the Sieve passage to be dried first.
  • As an aggregate for drying mineral mixtures have proven their worth.
  • Rotary drums for drying moist mineral goods are in Direction of conveyance of the material to be dried inclined drums through which either in countercurrent or in cocurrent to the material to be dried hot flue gases are introduced from an incinerator.
  • Such systems are operated with direct current when it is fresh Released damp material with the freshly introduced hot flue gases Achieve rapid drying success should, while the countercurrent process is used, for example, if the already pre-dried material to drive out the last one Residual moisture with the hot flue gas in the state of the highest Drying capacity should be brought into contact.
  • the technical problem underlying the invention is one Plant for drying and processing free-flowing mineral goods develop in which the intensity of stabilization is high and good Environmental compatibility is given.
  • the system according to the invention has the advantage that the moist mixture which is added is brought into contact with the fresh, not yet cooled, hot flue gases immediately upon being placed in the rotary drum and is heated in a shock-like manner. As a result, the soft grains, which preferentially absorb water, decay through decrepitation.
  • the material to be dried is lifted into a position in the upper area of the rotating drum by the internals, in order then to fall down over the largest possible distance in the drum, with further stabilization occurring.
  • the flue gas stream sucked in the conveying direction forms a strong flow, which captures and carries the dusty and fine-grained components. The flow rate is increased by the Venturi installation.
  • the bypass for conveying air in the drum jacket ensures that additional conveying air is drawn in from the environment when the vacuum in the drum is greater, without this additional conveying air disrupting the air / fuel mixture in the incineration system and thus the optimal combustion, which also very significantly additional NO x formation is avoided.
  • the subclaims relate to advantageous refinements. Because of the engagement of a speed-controlled fan is influencing the suction and thus of the negative pressure in the drum advantageously possible. This can also Intensity of the stabilization can be influenced. Because of the venturi installation sucked gas streams are dust-laden, is only partially by the The formation of the guiding surfaces means that no materials are used in the Venturi installation accumulate or build up, which increases the flow resistance in the drum would increase.
  • the construction of the internals as alternating straight plates and alternating plates bent in the longitudinal direction to form a pocket causes a Mixing the material to be dried and lifting the material drying goods when rotating the drum up to the top of the drum volume.
  • the formation of the upward gas flow in the shaft leads to a wind sifting of the discharged goods in such a way that granular material falls down against the gas flow, while the fine grain and dusty material with the gas flow up to the transfer device in a dedusting system is operated.
  • the rotary drum 1 is a sectional side view shown. In the illustration, one is to the left of the rotary drum 1 Combustion device 2 is shown schematically.
  • the flue gas stream of the combustion device the is represented by a large arrow in the direction of flow and the Rotary drum 1 leaves the shaft 6 on the outlet side and there after is led above to the transfer device 22, which leads to a dedusting system leads.
  • a fan 7 is arranged behind the transfer device 22 and is suitable for a corresponding negative pressure and suction in the rotary drum 1 and in Shaft 6 provides. In co-current with the flue gas flow with the Entry device 23 the material to be dried into the rotary drum 1 given up.
  • the Drum shell designed as transport blades 3 internals in the Area arranged, which is shown hatched in the drawing.
  • the weird built-in transport blades 3 have a curvature that is strongly in Has direction of action acting component.
  • At the transport blades 3 are built-in blades, which in Rows are arranged one behind the other and alternately straight plates 4 and have plates 5 bent in the longitudinal direction to form pockets.
  • the straight ones Plates 4 effect the mixing of the material to be dried.
  • the bent plates 5 take in a position in the lower drum area the material to be dried and lift it when the rotary drum 1 rotates by practically 180 ° up to the top drum area, from where that to drying goods falling down over a great height.
  • the negative pressure generated with the help of the fan 7 creates a Gas flow in the rotating drum, which is essentially the flue gases of the Combustion device 2 comprises.
  • This gas flow is through the coaxial Venturi installation 8 performed, whereby the flow rate is increased.
  • Fine-grained and dust-like particles are detected and discharged into the shaft 6.
  • At the discharge end of the rotary drum 1 is also the lumpy and granular dry goods are discharged into the shaft. Since in Shaft 6 is a vertical flow, it acts as a Air classifier and leads the fine-grained and dusty parts of the dried goods with themselves up to the transfer device 22, from where the Dust and fine grain loaded gas stream to a downstream Dedusting system is performed.
  • the rotary drum is inclined and has an angle ⁇ in the conveying direction two longitudinally spaced circumferential rings 18 on which the Rotary drive 19 attacks.
  • the rear circumferential ring 18 rolls in the conveying direction from a stop wheel 20, which is rotatably mounted, thereby preventing is that the rotary drum is moved axially in the conveying direction.
  • the Entry device 23 and the discharge device 21 can both as a belt as well as a snail, with a snail advantages in Has seal.
  • FIG. 2 the one shown in FIG. 1 by a dash-dotted line Section II shown on an enlarged scale showing the structure of the bypass 9 in the drum jacket shows.
  • an opening 10 is arranged in the drum shell, which from Circumferential box 16 is covered.
  • Several of the openings 10 can be distributed around the circumference, total of a gastight annular Circumferential box 16 are covered.
  • Is over a coaxial double jacket 24 the box 16 connected to a second peripheral box 17, the Double jacket 24 an annular gap 14 between the drum jacket and Double jacket 24 forms.
  • the second circumferential box 17 is also at least one opening 12 is arranged to the environment through a outside biased flap 13 is sealed inside.
  • the two Circumferential boxes 16 and 17 and the double jacket 24 have a Thermal insulation 15, which is hatched in the illustration Stripe is shown.
  • the mode of operation of the bypass is such that with a corresponding Vacuum in the rotary drum 1, which is at least equal to or greater than
  • the biasing force of the flap 13 is the opening 12 by suction of the flap 13 is released so that ambient air is sucked in and as a result of Heat radiation through the drum jacket preheated into the rotating drum be sucked in.
  • Fig. 3 the structure of the coaxial venturi 8 is shown schematically.
  • the guide surfaces are only partially formed, so that sufficient free flow cross-section between the formed guiding surfaces remains. This avoids that the trained guide surfaces attaches too much of the dust load of the gas flow and possibly builds up what otherwise lead to an undesirable increase in flow resistance could.
  • the proportion of guiding surfaces designed is sufficient to cover the gas flow center and the flow velocity in the manner of a Venturi nozzle increase.

Abstract

System for drying and processing pourable mineral material comprises a rotating drum (1) angled in the conveying direction of the material to be treated and provided on its inner periphery with built-in components such as transport blades (3) arranged in the front insertion region for the material. The system also comprises a combustion device (2), a ventilator (7) and a venturi assembly (8). A bypass (9) for conveying air is arranged in the drum casing in the insertion region. Preferred Features: At least one silo for particulate material is arranged behind a discharge device (21) and at least one silo for dust is arranged behind the dedusting system.

Description

Die Erfindung betrifft eine Anlage zum Trocknen und Aufbereiten von rieselfähigem mineralischem Gut, insbesondere Kohle gemäß dem Oberbegriff von Patentanspruch 1. Mineralisches Gut fällt bei der Gewinnung und Aufbereitung meistens in Form eines Gemisches von stückigem oder körnigem Gut und feinstkörnigem und staubigem Gut an. Um dieses Gemisch in vorgegebene Fraktionen, zum Beispiel Stückgut, grobkörniges, feinstkörniges und staubförmiges Gut trennen zu können, wird zunächst der Anteil oberhalb eines vorgegebenen Korndurchmessers als Stückgut durch Siebung abgetrennt. Um aus dem Siebdurchgang den grobkörnigen Anteil vom feinstkörnigen und staubförmigen Anteil weiter abtrennen zu können, muß der Siebdurchgang zunächst getrocknet werden. Als Aggregat zum Trocknen mineralischer Gemische haben sich Drehtrommeln bewährt.The invention relates to a plant for drying and processing free-flowing mineral goods, especially coal according to the generic term of claim 1. Mineral material falls in the extraction and Processing mostly in the form of a mixture of lumpy or granular Good and fine-grained and dusty good. To mix this in predetermined fractions, for example general cargo, coarse-grained, fine-grained and to be able to separate dusty material, the proportion above is first a predetermined grain diameter as a piece goods by sieving separated. In order to remove the coarse-grained portion of the To be able to separate fine-grained and dust-like part further, the Sieve passage to be dried first. As an aggregate for drying mineral mixtures have proven their worth.

Drehtrommeln zum Trocknen von feuchtem mineralischem Gut sind in Förderrichtung des zu trocknenden Gutes geneigte Trommeln, durch die entweder im Gegenstrom oder im Gleichstrom zu dem zu trocknenden Gut heiße Rauchgase aus einer Verbrennungsanlage eingeleitet werden. Im Gleichstrom werden solche Anlagen dann betrieben, wenn das frisch aufgegebene feuchte Gut mit den frisch eingeleiteten heißen Rauchgasen zur Erzielung eines raschen Trocknungserfolges in Berührung gebracht werden soll, während das Gegenstromverfahren beispielsweise dann angewendet wird, wenn das bereits vorgetrocknete Gut zum Austreiben der letzten Feuchtigkeitsreste mit dem heißen Rauchgas im Zustand der höchsten Trocknungskapazität in Berührung gebracht werden soll.Rotary drums for drying moist mineral goods are in Direction of conveyance of the material to be dried inclined drums through which either in countercurrent or in cocurrent to the material to be dried hot flue gases are introduced from an incinerator. in the Such systems are operated with direct current when it is fresh Released damp material with the freshly introduced hot flue gases Achieve rapid drying success should, while the countercurrent process is used, for example, if the already pre-dried material to drive out the last one Residual moisture with the hot flue gas in the state of the highest Drying capacity should be brought into contact.

Anlagen der beschriebenen Art werden auch Drehrohröfen genannt. Ein im Gegenstrom betriebener Drehrohrofen ist in der DE 42 43 264 A1 beschrieben. Weitere Drehöfen sind zum Beispiel in der EP 0 032 468 A, FR 2 441 682 A, FR-PS 1 116 508, US-PS 4 189 300, EP 0 030 403 A, BE-PS 858 730, DE 31 10 380 A1 und DE 38 15 104 A1 beschrieben.Systems of the type described are also called rotary kilns. An im Counterflow operated rotary kiln is described in DE 42 43 264 A1. Further rotary furnaces are described, for example, in EP 0 032 468 A, FR 2 441 682 A, FR-PS 1 116 508, US-PS 4 189 300, EP 0 030 403 A, BE-PS 858 730, DE 31 10 380 A1 and DE 38 15 104 A1 are described.

Ein im Gleichstrom betriebener Drehrohrofen der eingangs genannten Art ist aus der US-PS 4 318 620 bekannt.A rotary kiln operated in direct current of the type mentioned is known from U.S. Patent 4,318,620.

Bei den verschiedenen Sorten mineralischer Güter können ganz unterschiedliche Ziele der Behandlung des Gutes beim Trocknen verfolgt werden. Soll das mineralische Gut möglichst ohne weiteren Abrieb und Zerstörung getrocknet werden, wird das Gut in der Drehtrommel vorsichtig und schonend behandelt. Handelt es sich jedoch um ein Gemisch aus harten formstabilen Körnern und weichen, zum Zerfall neigenden Körnern, kann beim Trocknen eine Stabilisierung dadurch erreicht werden, daß die Körner gezielt beim Trocknen und Durchwandern der Drehtrommel stark strapaziert werden mit dem Ziel, die weicheren Körner zu zerstören, damit diese als feinstkörniges oder staubförmiges Gut anfallen.With the different types of mineral goods, whole pursued different goals of treating the goods when drying become. If the mineral good should be without further abrasion and Dried to destruction, the goods in the rotary drum are careful and treated gently. However, it is a mixture of hard dimensionally stable grains and soft grains that tend to disintegrate Drying stabilization can be achieved by targeting the grains be heavily used when drying and wandering through the rotating drum with the aim of destroying the softer grains so that they are fine-grained or dusty goods.

Das der Erfindung zugrundeliegende technische Problem besteht darin, eine Anlage zum Trocknen und Aufbereiten von rieselfähigem mineralischem Gut zu entwickeln, bei der die Intensität der Stabilisierung hoch und eine gute Umweltverträglichkeit gegeben ist.The technical problem underlying the invention is one Plant for drying and processing free-flowing mineral goods develop in which the intensity of stabilization is high and good Environmental compatibility is given.

Diese Aufgabe wird mit einer Anlage mit den Merkmalen des Patentanspruchs 1 gelöst. Die erfindungsgemäße Anlage hat den Vorteil, daß das aufgegebene feuchte Gemisch sofort bei der Aufgabe in die Drehtrommel mit den frischen, noch nicht abgekühlten heißen Rauchgasen in Kontakt gebracht wird und schockartig erwärmt wird. Dadurch zerfallen die weichen Körner, die bevorzugt Wasser absorbieren, durch Dekrepitation. Beim weiteren Durchgang durch die Drehtrommel wird das zu trocknende Gut durch die Einbauten in eine Lage im oberen Bereich der Drehtrommel gehoben, um dann über eine möglichst große Strecke in der Trommel nach unten zu fallen, wobei eine weitere Stabilisierung eintritt. Der in Förderrichtung gesaugte Rauchgasstrom bildet eine starke Strömung, die die staubförmigen und feinstkörnigen Bestandteile erfaßt und mitträgt. Die Strömungsgeschwindigkeit wird durch den Venturieinbau erhöht. Durch den Bypass für Förderluft im Trommelmantel wird gewährleistet, daß bei größerem Unterdruck in der Trommel zusätzliche Förderluft aus der Umgebung angesaugt wird, ohne durch diese zusätzliche Förderluft das Luft/Brennstoffgemisch in der Verbrennungsanlage und damit die optimale Verbrennung zu stören, wodurch ganz wesentlich auch eine zusätzliche NOx-Bildung vermieden wird.This object is achieved with a system with the features of claim 1. The system according to the invention has the advantage that the moist mixture which is added is brought into contact with the fresh, not yet cooled, hot flue gases immediately upon being placed in the rotary drum and is heated in a shock-like manner. As a result, the soft grains, which preferentially absorb water, decay through decrepitation. During the further passage through the rotating drum, the material to be dried is lifted into a position in the upper area of the rotating drum by the internals, in order then to fall down over the largest possible distance in the drum, with further stabilization occurring. The flue gas stream sucked in the conveying direction forms a strong flow, which captures and carries the dusty and fine-grained components. The flow rate is increased by the Venturi installation. The bypass for conveying air in the drum jacket ensures that additional conveying air is drawn in from the environment when the vacuum in the drum is greater, without this additional conveying air disrupting the air / fuel mixture in the incineration system and thus the optimal combustion, which also very significantly additional NO x formation is avoided.

Die Unteransprüche betreffen vorteilhafte Ausgestaltungen. Durch den Einsatz eines drehzahlgeregelten Ventilators ist die Beeinflussung des Sogs und damit des Unterdrucks in der Trommel vorteilhaft möglich. Hierdurch kann auch die Intensität der Stabilisierung beeinflußt werden. Da die durch den Venturieinbau gesaugten Gasströme staubbeladen sind, wird durch die nur teilweise Ausbildung der Leitflächen bewirkt, daß sich im Venturieinbau keine Materialien stauen oder aufbauen, wodurch sich der Strömungswiderstand in der Trommel erhöhen würde.The subclaims relate to advantageous refinements. Because of the engagement of a speed-controlled fan is influencing the suction and thus of the negative pressure in the drum advantageously possible. This can also Intensity of the stabilization can be influenced. Because of the venturi installation sucked gas streams are dust-laden, is only partially by the The formation of the guiding surfaces means that no materials are used in the Venturi installation accumulate or build up, which increases the flow resistance in the drum would increase.

Wenn das Einlaßende der Trommel abdichtend an die Verbrennungseinrichtung angeschlossen ist, wird das Ansaugen von nicht vorgewärmter Frischluft vermieden. Dadurch, daß die Bypass-Öffnung im Trommelmantel erst im Abstand hinter dem Einlaßende angeordnet ist, wird bewirkt, daß die unmittelbar am Einlaßende angesaugte Umgebungsluft beim Strömen durch den Ringspalt zwischen Trommelmantel und Doppelmantel vorgewärmt wird, so daß die Aufheizung zur Unterstützung der Trocknung genutzt und die Trocknung nicht durch Ansaugen nicht vorgewärmter, kühler Umgebungsluft negativ beeinflußt wird. Durch die Wärmeisolierung des Doppelmantels und der Umfangskästen wird bewirkt, daß die aus der Trommel abgestrahlte Wärme zur Vorwärmung des Bypassgases wirksam wird und nicht durch Abstrahlung an die Umgebung verlorengeht.When the inlet end of the drum seals against the Combustion device is connected, the suction of not Preheated fresh air avoided. The fact that the bypass opening in Drum casing is only arranged at a distance behind the inlet end causes the ambient air sucked in directly at the inlet end at Flow through the annular gap between the drum casing and the double casing is preheated so that the heating to support drying used and the drying not by sucking in not preheated, cooler Ambient air is adversely affected. Due to the thermal insulation of the Double jacket and the peripheral boxes is caused to come out of the drum radiated heat for preheating the bypass gas is effective and not is lost through radiation to the environment.

Die Ausbildung der Einbauten als abwechselnd gerade Platten und alternierend in Längsrichtung taschenbildend abgebogene Platten bewirkt eine Durchmischung des zu trocknenden Gutes und das Anheben des zu trocknenden Gutes beim Rotieren der Trommel bis in die obersten Bereiche des Trommelvolumens. Die Anordnung eines ortsfest drehbar gelagerten Anschlagrades derart, daß zumindest ein Umfangsring dagegen abrollt, verhindert in vorteilhafter Weise, daß die Drehtrommel in Neigungsrichtung bewegt wird. Die Ausbildung des nach oben gerichteten Gasstroms im Schacht führt zu einer Windsichtung des ausgetragenen Gutes in der Weise, daß das körnige Gut gegen den Gasstrom nach unten fällt, während das feinstkörnige und staubförmige Gut mit dem Gasstrom nach oben zur Überleiteinrichtung in eine Entstaubungsanlage geführt wird.The construction of the internals as alternating straight plates and alternating plates bent in the longitudinal direction to form a pocket causes a Mixing the material to be dried and lifting the material drying goods when rotating the drum up to the top of the drum volume. The arrangement of a stationary rotatable Stop wheel in such a way that at least one circumferential ring rolls against it, advantageously prevents the rotary drum from tilting is moved. The formation of the upward gas flow in the shaft leads to a wind sifting of the discharged goods in such a way that granular material falls down against the gas flow, while the fine grain and dusty material with the gas flow up to the transfer device in a dedusting system is operated.

Die beschriebenen Merkmale und Vorteile werden bei der Beschreibung eines Ausführungsbeispiels, das in der beigefügten Zeichnung dargestellt ist, anschaulich dargestellt.The features and advantages described are described in the description of a Embodiment, which is illustrated in the accompanying drawings, illustrated clearly.

In der Zeichnung zeigt:The drawing shows:

Fig. 1Fig. 1
in schematischer Seitenansicht eine Drehtrommel,a schematic side view of a rotary drum,
Fig. 2Fig. 2
den Ausschnitt II aus Fig. 1 in vergrößertem Maßstab undthe section II of Fig. 1 on an enlarged scale and
Fig. 3Fig. 3
in vergrößerter und perspektivischer Darstellung einen Venturieinbau.in an enlarged and perspective view Venturi installation.

In Fig. 1 ist die Drehtrommel 1 in einer Seitenansicht in geschnittener Form dargestellt. In der Darstellung ist links von der Drehtrommel 1 eine Verbrennungseinrichtung 2 schematisch dargestellt. In die Eintrittsseite der Drehtrommel strömt der Rauchgasstrom der Verbrennungseinrichtung, der durch einen großen Pfeil in Strömungsrichtung dargestellt ist und die Drehtrommel 1 auf der Austrittsseite in den Schacht 6 verläßt und dort nach oben zur Überleiteinrichtung 22 geführt wird, die zu einer Entstaubungsanlage führt. Hinter der Überleiteinrichtung 22 ist ein Ventilator 7 angeordnet, der für einen entsprechenden Unterdruck und Sog in der Drehtrommel 1 und im Schacht 6 sorgt. Im Gleichstrom mit dem Rauchgasstrom wird mit der Eintragsvorrichtung 23 das zu trocknende Gut in die Drehtrommel 1 aufgegeben. Am Eintragsende der Drehtrommel 1 sind auf dem Trommelmantel als Transportschaufeln 3 ausgebildete Einbauten in dem Bereich angeordnet, der in der Zeichnung schraffiert dargestellt ist. Die schräg eingebauten Transportschaufeln 3 weisen eine Krümmung auf, die eine stark in Förderrichtung wirkende Komponente hat.In Fig. 1, the rotary drum 1 is a sectional side view shown. In the illustration, one is to the left of the rotary drum 1 Combustion device 2 is shown schematically. In the entry page of the Rotary drum flows the flue gas stream of the combustion device, the is represented by a large arrow in the direction of flow and the Rotary drum 1 leaves the shaft 6 on the outlet side and there after is led above to the transfer device 22, which leads to a dedusting system leads. A fan 7 is arranged behind the transfer device 22 and is suitable for a corresponding negative pressure and suction in the rotary drum 1 and in Shaft 6 provides. In co-current with the flue gas flow with the Entry device 23 the material to be dried into the rotary drum 1 given up. At the entry end of the rotary drum 1 are on the Drum shell designed as transport blades 3 internals in the Area arranged, which is shown hatched in the drawing. The weird built-in transport blades 3 have a curvature that is strongly in Has direction of action acting component.

An die Transportschaufeln 3 schließen sich Schaufeleinbauten an, die in Reihen hintereinander angeordnet sind und alternierend gerade Platten 4 und in Längsrichtung taschenbildend abgebogene Platten 5 aufweisen. Die geraden Platten 4 bewirken die Durchmischung des zu trocknenden Gutes. Die abgebogenen Platten 5 nehmen in einer Stellung im unteren Trommelbereich das zu trocknende Gut auf und heben es bei der Rotation der Drehtrommel 1 um praktisch 180° bis in den obersten Trommelbereich an, von wo das zu trocknende Gut über eine große Höhe nach unten fällt.At the transport blades 3 are built-in blades, which in Rows are arranged one behind the other and alternately straight plates 4 and have plates 5 bent in the longitudinal direction to form pockets. The straight ones Plates 4 effect the mixing of the material to be dried. The bent plates 5 take in a position in the lower drum area the material to be dried and lift it when the rotary drum 1 rotates by practically 180 ° up to the top drum area, from where that to drying goods falling down over a great height.

Durch den mit Hilfe des Ventilators 7 erzeugten Unterdruck entsteht ein Gasstrom in der Drehtrommel, der im wesentlichen die Rauchgase der Verbrennungseinrichtung 2 umfaßt. Dieser Gasstrom wird durch den koaxialen Venturieinbau 8 geführt, wodurch die Strömungsgeschwindigkeit erhöht wird. Von dem Gasstrom werden feinstkörnige und staubförmige Partikel erfaßt und in den Schacht 6 ausgetragen. Am Austragsende der Drehtrommel 1 wird auch das stückige und körnige Trockengut in den Schacht ausgetragen. Da im Schacht 6 eine vertikale Strömung ausgebildet ist, wirkt diese wie ein Windsichter und führt die feinstkörnigen und staubförmigen Anteile des getrockneten Gutes mit sich nach oben zur Überleiteinrichtung 22, von wo der Staub- und Feinstkorn beladene Gasstrom zu einer nachgeschalteten Entstaubungsanlage geführt wird.The negative pressure generated with the help of the fan 7 creates a Gas flow in the rotating drum, which is essentially the flue gases of the Combustion device 2 comprises. This gas flow is through the coaxial Venturi installation 8 performed, whereby the flow rate is increased. Fine-grained and dust-like particles are detected and discharged into the shaft 6. At the discharge end of the rotary drum 1 is also the lumpy and granular dry goods are discharged into the shaft. Since in Shaft 6 is a vertical flow, it acts as a Air classifier and leads the fine-grained and dusty parts of the dried goods with themselves up to the transfer device 22, from where the Dust and fine grain loaded gas stream to a downstream Dedusting system is performed.

Die Drehtrommel ist in Förderrichtung um einen Winkel α geneigt und weist zwei in Längsrichtung beabstandete Umfangsringe 18 auf, an denen der Drehantrieb 19 angreift. Der in Förderrichtung hintere Umfangsring 18 rollt an einem Anschlagrad 20 ab, das ortsfest drehbar gelagert ist, wodurch verhindert wird, daß die Drehtrommel in Förderrichtung axial bewegt wird. Die Eintragsvorrichtung 23 und die Austragsvorrichtung 21 können sowohl als Band als auch als Schnecke ausgebildet sein, wobei eine Schnecke Vorteile bei der Abdichtung aufweist.The rotary drum is inclined and has an angle α in the conveying direction two longitudinally spaced circumferential rings 18 on which the Rotary drive 19 attacks. The rear circumferential ring 18 rolls in the conveying direction from a stop wheel 20, which is rotatably mounted, thereby preventing is that the rotary drum is moved axially in the conveying direction. The Entry device 23 and the discharge device 21 can both as a belt as well as a snail, with a snail advantages in Has seal.

In Fig. 2 ist der in Fig. 1 durch eine strichpunktierte Linie kenntlich gemachte Ausschnitt II in vergrößertem Maßstab dargestellt, der den Aufbau des Bypass 9 im Trommelmantel zeigt. In einem Abstand vom Eintragsende der Drehtrommel 1 ist eine Öffnung 10 im Trommelmantel angeordnet, die vom Umfangskasten 16 überdeckt ist. Von den Öffnungen 10 können mehrere über den Umfang verteilt sein, die insgesamt von einem gasdichten ringförmigen Umfangskasten 16 überdeckt sind. Über einen koaxialen Doppelmantel 24 ist der Kasten 16 mit einem zweiten Umfangskasten 17 verbunden, wobei der Doppelmantel 24 einen Ringspalt 14 zwischen Trommelmantel und Doppelmantel 24 bildet. Im zweiten Umfangskasten 17 ist ebenfalls mindestens eine Öffnung 12 zur Umgebung angeordnet, die durch eine nach außen vorgespannte Klappe 13 innen abdichtend verschlossen ist. Die beiden Umfangskästen 16 und 17 sowie der Doppelmantel 24 weisen eine Wärmeisolierung 15 auf, die in der Darstellung durch einen schraffierten Streifen dargestellt ist.In FIG. 2, the one shown in FIG. 1 by a dash-dotted line Section II shown on an enlarged scale showing the structure of the bypass 9 in the drum jacket shows. At a distance from the end of the entry Rotary drum 1, an opening 10 is arranged in the drum shell, which from Circumferential box 16 is covered. Several of the openings 10 can be distributed around the circumference, total of a gastight annular Circumferential box 16 are covered. Is over a coaxial double jacket 24 the box 16 connected to a second peripheral box 17, the Double jacket 24 an annular gap 14 between the drum jacket and Double jacket 24 forms. In the second circumferential box 17 is also at least one opening 12 is arranged to the environment through a outside biased flap 13 is sealed inside. The two Circumferential boxes 16 and 17 and the double jacket 24 have a Thermal insulation 15, which is hatched in the illustration Stripe is shown.

Die Wirkungsweise des Bypass ist derart, daß bei einem entsprechenden Unterdruck in der Drehtrommel 1, der mindestens gleich oder größer der Vorspannkraft der Klappe 13 ist, durch Ansaugen der Klappe 13 die Öffnung 12 derart freigegeben wird, daß Umgebungsluft angesaugt und infolge der Wärmeabstrahlung durch den Trommelmantel vorgewärmt in die Drehtrommel eingesaugt werden. Dadurch kann bei entsprechender Erhöhung des Unterdrucks und damit des Soges in der Drehtrommel 1 der Fördergasstrom erhöht werden, ohne daß dadurch das Brennstoff/Brennluftverhältnis der Verbrennungseinrichtung geändert wird.The mode of operation of the bypass is such that with a corresponding Vacuum in the rotary drum 1, which is at least equal to or greater than The biasing force of the flap 13 is the opening 12 by suction of the flap 13 is released so that ambient air is sucked in and as a result of Heat radiation through the drum jacket preheated into the rotating drum be sucked in. With a corresponding increase in Vacuum and thus the suction in the rotary drum 1 of the gas flow can be increased without the fuel / combustion air ratio Incinerator is changed.

In Fig. 3 ist schematisch der Aufbau des koaxialen Venturieinbaus 8 dargestellt. Bei diesem Venturieinbau sind die Leitflächen nur teilweise ausgebildet, so daß zwischen den ausgebildeten Leitflächen genügend freier Strömungsquerschnitt verbleibt. Dadurch wird vermieden, daß sich an den ausgebildeten Leitflächen zuviel von der Staubbelastung des Gasstroms ansetzt und ggf. aufbaut, was sonst zu einer unerwünschten Erhöhung des Strömungswiderstandes führen könnte. Der Anteil der ausgebildeten Leitflächen reicht aus, um den Gasstrom zu zentrieren und in Art einer Venturidüse die Strömungsgeschwindigkeit zu erhöhen. In Fig. 3 the structure of the coaxial venturi 8 is shown schematically. In this venturi installation, the guide surfaces are only partially formed, so that sufficient free flow cross-section between the formed guiding surfaces remains. This avoids that the trained guide surfaces attaches too much of the dust load of the gas flow and possibly builds up what otherwise lead to an undesirable increase in flow resistance could. The proportion of guiding surfaces designed is sufficient to cover the gas flow center and the flow velocity in the manner of a Venturi nozzle increase.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Drehtrommelrotary drum
22
Verbrennungseinrichtungincinerator
33
Trommeleinbauten, TransportschaufelnDrum internals, transport blades
44
Trommeleinbauten, gerade PlattenDrum internals, straight plates
55
Trommeleinbauten, abgebogene PlattenDrum internals, bent plates
66
Schachtshaft
77
Ventilatorfan
88th
Venturieinbauventuri installation
99
Bypassbypass
1010
Öffnung im TrommelmantelOpening in the drum jacket
1212
Öffnung im UmfangskastenOpening in the circumferential box
1313
nach außen vorgespannte Klappeflap biased towards the outside
1414
Ringspaltannular gap
1515
Wärmeisolierungthermal insulation
1616
gasdichter Umfangskastengastight circumferential box
1717
Umfangskastenscope box
1818
Umfangsringecircumferential rings
1919
Drehantriebrotary drive
2020
Anschlagradstop wheel
2121
Austragsvorrichtungdischarge
2222
Überleiteinrichtunggateway
2323
Eintragsvorrichtungentry device
2424
Doppelmanteljacketed
αα
Neigungswinkel DrehtrommelTilt angle of rotating drum

Claims (10)

Anlage zum Trocknen und Aufbereiten von rieselfähigem mineralischem Gut mit einer Drehtrommel (1), die in Förderrichtung des zu behandelnden Gutes geneigt und mit Einbauten (3, 4, 5) am Innenumfang versehen ist, wobei im vorderen Einführungsbereich für das zu behandelnde Gut als Einbauten Transportschaufeln (3) angeordnet sind, und wobei das Auslaßende der Drehtrommel (1) abdichtend an einen Schacht (6) angeschlossen ist, der das aus der Drehtrommel (1) austretende Gut und den Gasstrom übernimmt,
   einer Verbrennungseinrichtung (2), deren Rauchgase im Gleichstrom mit dem zu behandelnden Gut durch die Drehtrommel (1) führbar sind,
   einem Ventilator (7), der den Schacht (6) unter Unterdruck setzt, und
   einem Venturieinbau (8), der in der Drehtrommel (1) vor ihrem Auslaßende koaxial angeordnet ist,
dadurch gekennzeichnet, daß im Einführungsbereich des zu behandelnden Gutes im Trommelmantel ein Bypass (9) für Förderluft angeordnet ist.System for drying and processing free-flowing mineral goods with a rotating drum (1), which is inclined in the direction of conveyance of the goods to be treated and is equipped with internals (3, 4, 5) on the inner circumference, with internals in the front entry area for the material to be treated Transport blades (3) are arranged, and the outlet end of the rotary drum (1) is sealingly connected to a shaft (6) which takes over the material emerging from the rotary drum (1) and the gas flow,
a combustion device (2), the flue gases of which can be passed through the rotary drum (1) in cocurrent with the material to be treated,
a fan (7) which pressurizes the shaft (6), and
a venturi installation (8) which is arranged coaxially in the rotary drum (1) before its outlet end,
characterized in that a bypass (9) for conveying air is arranged in the drum casing in the introduction region of the material to be treated. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß der Ventilator (7) drehzahlgeregelt ist.System according to claim 1, characterized in that the fan (7) is speed-controlled. Anlage nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Leitflächen des Venturieinbaus (8) entlang des Umfangs nur abschnittsweise ausgebildet sind.System according to claim 1 or 2, characterized in that the guide surfaces of the Venturi installation (8) are formed only in sections along the circumference. Anlage nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Einlaßende der Drehtrommel (1) abdichtend an die Verbrennungseinrichtung (2) angeschlossen ist. Installation according to one of claims 1 to 3, characterized in that the inlet end of the rotary drum (1) is sealingly connected to the combustion device (2). Anlage nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Bypass (9) mindestens eine im Abstand hinter dem Einlaßende ausgebildete Öffnung (10) im Trommelmantel umfaßt, wobei mehrere Öffnungen (10) über den Umfang verteilt im Trommelmantel angeordnet und von einem gasdichten Kasten (16) überdeckt sind, der über dem Umfang auf dem Trommelmantel angeordnet und über einen Ringspalt (14) zwischen Trommelmantel und einem Doppelmantel mit einem in Förderrichtung davor angeordneten zweiten Umfangskasten (17) verbunden ist, der mindestens eine Öffnung (12) zur Umgebung aufweist, die durch eine nach außen vorgespannte Klappe (13) innen abdichtend verschlossen wird.Installation according to one of Claims 1 to 4, characterized in that the bypass (9) comprises at least one opening (10) in the drum casing which is formed at a distance behind the inlet end, a plurality of openings (10) being distributed over the circumference in the drum casing and by one gas-tight box (16) are covered, which is arranged over the circumference on the drum jacket and is connected via an annular gap (14) between the drum jacket and a double jacket to a second circumferential box (17) arranged in front in the conveying direction, which has at least one opening (12) for Has surroundings, which is sealed inside by a flap (13) preloaded on the outside. Anlage nach Anspruch 5, dadurch gekennzeichnet, daß die Umfangskästen (16, 17) und der Doppelmantel (24) zur Umgebung eine Wärmeisolierung (15) aufweisen.System according to claim 5, characterized in that the peripheral boxes (16, 17) and the double jacket (24) have thermal insulation (15) from the surroundings. Anlage nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß sich an die Transportschaufeln (3) Schaufeleinheiten anschließen, die in Reihen hintereinander am Trommelumfang angeordnet sind und abwechselnd gerade Platten (4) und in Längsrichtung taschenbildend abgebogene Platten (5) aufweisen.Plant according to one of claims 1 to 6, characterized in that the transport blades (3) are followed by blade units which are arranged in rows one behind the other on the drum circumference and have alternating straight plates (4) and plates (5) bent in the longitudinal direction to form pockets. Anlage nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Trommel zwei in Längsrichtung beabstandete Umfangsringe (18) aufweist, an denen der Drehantrieb (19) angreift, wobei mindestens einer der Umfangsringe (18) gegen ein ortsfest drehbar gelagertes Anschlagrad (20) abrollt.Installation according to one of claims 1 to 7, characterized in that the drum has two circumferentially spaced circumferential rings (18) on which the rotary drive (19) engages, at least one of the circumferential rings (18) against a stop wheel (20) which is rotatably mounted in a stationary manner ) rolls. Anlage nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß in dem Schacht (6) ein nach oben gerichteter Gasstrom ausgebildet ist und unterhalb des Schachtes (6) eine Austragsvorrichtung (21) für das körnige Gut und oberhalb des Schachtes (6) eine Überleiteinrichtung (22) in eine Entstaubungsanlage angeordnet ist. Installation according to one of claims 1 to 8, characterized in that an upward gas flow is formed in the shaft (6) and a discharge device (21) for the granular material underneath the shaft (6) and one above the shaft (6) Transfer device (22) is arranged in a dedusting system. Anlage nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß hinter der Austragsvorrichtung (21) mindestens ein Silo für körniges und stückiges Gut und hinter der Entstaubungsanlage mindestens ein Silo für den Staub angeordnet ist.Plant according to one of claims 1 to 9, characterized in that at least one silo for granular and lumpy material is arranged behind the discharge device (21) and at least one silo for the dust behind the dedusting plant.
EP03019112A 2002-08-31 2003-08-23 Installation for drying and treating of mineral pourable material Expired - Fee Related EP1394489B1 (en)

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DE10240249A DE10240249B3 (en) 2002-08-31 2002-08-31 System for drying and processing pourable mineral material comprises a rotating drum with built-in components, a combustion device, a ventilator, a venturi assembly, and a bypass for conveying air
DE10240249 2002-08-31

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CN104789246A (en) * 2015-04-13 2015-07-22 陕西煤业化工集团神木天元化工有限公司 Low-rank coal powder rotary drying technology with dust removing function
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EP3967659A4 (en) * 2019-05-07 2023-08-16 Inner Mongolia Puruifen Environmental Protection Technology Co., Ltd. Lifting flight assembly for use in rotary furnace, and rotary furnace

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Also Published As

Publication number Publication date
DE10240249B3 (en) 2004-02-26
US6823607B2 (en) 2004-11-30
EP1394489A3 (en) 2004-05-26
EP1394489B1 (en) 2005-04-13
US20040118006A1 (en) 2004-06-24
DE50300437D1 (en) 2005-05-19

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